ThinkPad T460p keeps restarting instead of shutting down

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  • rumpumpel1
    Senior Member
    • Jul 2019
    • 139
    • germany

    #1

    ThinkPad T460p keeps restarting instead of shutting down

    I have a ThinkPad T460p that keeps restarting instead of shutting down. The culprit is the LAN: if it is disabled in the BIOS, the problem is solved. I have already replaced the LAN chip (WGI219LM) twice, done CleanME, flashed another BIOS. Unfortunately all without success. What else can I check?
  • mon2
    Badcaps Legend
    • Dec 2019
    • 13909
    • Canada

    #2
    Check the voltage to ground of LANWAKE#. Confirm the pull-up resistor @ R243 is present and is ~4k7 ohms. Confirm there is a 3v3 (VCC3M) on pin 2 of this resistor.

    If LANWAKE# = 0 volts, then the logic board will 'wake up' since this is an active low signal which is denoted by the '#' suffix in the netname.

    Comment

    • rumpumpel1
      Senior Member
      • Jul 2019
      • 139
      • germany

      #3
      the resistance of RL5118 (pull-up resistor of LAN_WAKE#) is 3,7 kOhm (measured in place). VCC3M is present and LAN_WAKE# never drops to 0.
      In BIOS the option WAKE by LAN is disabled.

      Comment

      • mon2
        Badcaps Legend
        • Dec 2019
        • 13909
        • Canada

        #4
        Confirm the same setting within Windows.

        How to enable Wake on LAN - ThinkCentre (M Series) and ThinkStation (P Series) - Lenovo Support US

        Comment

        • rumpumpel1
          Senior Member
          • Jul 2019
          • 139
          • germany

          #5
          The measurement of the LAN_WAKE# signal was taken in Windows. During the whole shutdown and during the following startup the Signal was always 3,3V.
          I do not want to use the wake on LAN feature. It is disabled in BIOS intentionally.

          Comment

          • rumpumpel1
            Senior Member
            • Jul 2019
            • 139
            • germany

            #6
            I changed the GbE chip and now everything works as expected.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13909
              • Canada

              #7
              So the WGI219LM LAN controller was replaced for a 3rd time and now it is working? Did you source the part from a different vendor this time? Perhaps the previous ones were fakes?

              Comment

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